FREE SHIPPING SeaClear aquarium light hood with 1 fixture Either a replacement for your current SeaClear aquarium, Or use on top of any aquarium 19.5 x 6.875" - Fits 18x5" access opening Comes complete with ballast Additional Expand-A-light fixtures can be purchased and are easy to install. Fits a SeaClear 55 Show System II. Uses 18" T-8 Flourescent Bulb (not included)